P2pool seed peers not adding new peers

[SWvheerden]

Only peers with external addresses are added to the seed peers. This is due to the requirement that a peer can only be added to the peer database if they have en external dial-able address to dial. As soon as they get the relays they dont need to dial the seed peers anymore to get new addresses, but the seed peers never gets updated to include those peers.

[SWvheerden]

Perhaps we need to make this that if you are a relay, you periodically dial the seed peers to make sure they have your address.

We also dont want to make it that the seed peers only have non relay addresses, we need them to in effect only have the addreses of the relays

[stringhandler]

could also use the peer_info gossipsub publish when the external address changes. We need to make sure this isn't done too often